starocean999 commented on code in PR #50671:
URL: https://github.com/apache/doris/pull/50671#discussion_r2103652502


##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/CancelDecommissionBackendCommand.java:
##########
@@ -0,0 +1,122 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.apache.doris.nereids.trees.plans.commands;
+
+import org.apache.doris.analysis.StmtType;
+import org.apache.doris.catalog.Env;
+import org.apache.doris.common.AnalysisException;
+import org.apache.doris.common.ErrorCode;
+import org.apache.doris.common.ErrorReport;
+import org.apache.doris.mysql.privilege.PrivPredicate;
+import org.apache.doris.nereids.trees.plans.PlanType;
+import org.apache.doris.nereids.trees.plans.visitor.PlanVisitor;
+import org.apache.doris.qe.ConnectContext;
+import org.apache.doris.qe.StmtExecutor;
+import org.apache.doris.system.SystemInfoService;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
+
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * CancelDecommissionBackendCommand
+ */
+public class CancelDecommissionBackendCommand extends CancelCommand {
+    private final List<String> params;
+    private final List<SystemInfoService.HostInfo> hostInfos;
+    private final List<String> ids;
+
+    public CancelDecommissionBackendCommand(List<String> params) {
+        super(PlanType.CANCEL_DECOMMISSION_BACKEND_COMMAND);
+        Objects.requireNonNull(params, "params is null!");
+        this.params = params;
+        this.hostInfos = Lists.newArrayList();
+        this.ids = Lists.newArrayList();
+    }
+
+    @Override
+    public void run(ConnectContext ctx, StmtExecutor executor) throws 
Exception {
+        validate();
+        ctx.getEnv().getSystemHandler().cancel(this);
+    }
+
+    /**
+     * validate
+     */
+    public void validate() throws AnalysisException {
+        if 
(!Env.getCurrentEnv().getAccessManager().checkGlobalPriv(ConnectContext.get(), 
PrivPredicate.OPERATOR)) {
+            
ErrorReport.reportAnalysisException(ErrorCode.ERR_SPECIFIC_ACCESS_DENIED_ERROR,
+                    PrivPredicate.OPERATOR.getPrivs().toString());
+        }
+        for (String param : params) {
+            if (!param.contains(":")) {
+                ids.add(param);
+            } else {
+                SystemInfoService.HostInfo hostInfo = 
SystemInfoService.getHostAndPort(param);
+                this.hostInfos.add(hostInfo);
+            }
+
+        }
+        Preconditions.checkState(!this.hostInfos.isEmpty() || 
!this.ids.isEmpty(),
+                "hostInfos or ids can not be empty");
+    }
+
+    public List<SystemInfoService.HostInfo> getHostInfos() {
+        return hostInfos;
+    }
+
+    public List<String> getIds() {
+        return ids;
+    }
+
+    @Override
+    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
+        return visitor.visitCancelDecommissionCommand(this, context);
+    }
+
+    /**
+     * toSql
+     */
+    public String toSql() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("CANCEL DECOMMISSION BACKEND ");
+        if (!ids.isEmpty()) {
+            for (int i = 0; i < hostInfos.size(); i++) {
+                sb.append("\"").append(hostInfos.get(i)).append("\"");
+                if (i != hostInfos.size() - 1) {
+                    sb.append(", ");
+                }
+            }
+        } else {
+            for (int i = 0; i < params.size(); i++) {
+                sb.append("\"").append(params.get(i)).append("\"");
+                if (i != params.size() - 1) {
+                    sb.append(", ");
+                }
+            }
+        }
+        return sb.toString();
+    }
+

Review Comment:
   ```
   @Override
   protected void checkSupportedInCloudMode(ConnectContext ctx) throws 
DdlException {
       LOG.info("CancelDecommissionBackendCommand not supported in cloud mode");
       throw new DdlException("Unsupported operation");
   }
   ```



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